On Windows, none uses accept() rather than AcceptEx() and will not recycle sockets between connections. This is useful for network adapters with broken driver support, as well as some virtual network providers such as vpn drivers, or spam, virus or spyware filters.

The AcceptFilter https none is what we have traditionally used to fix this problem - but it seems from Apache 2.4.24+ this setting has a better default, and will use "connect", rather than "data". Which will avoid this problem (and also it seems bypass a DOS attack) : as per the link above :

The data AcceptFilter (Windows)

For versions 2.4.23 and prior, the Windows data accept filter waited until data had been transmitted and the initial data buffer and network endpoint addresses had been retrieved from the single AcceptEx() invocation. This implementation was subject to a denial of service attack and has been disabled.

Current releases of httpd default to the connect filter on Windows, and will fall back to connect if data is specified. Users of prior releases are encouraged to add an explicit setting of connect for their AcceptFilter, as shown above.